Transmission mechanism



7 1927. June J. c, HEYDA TRANSMISSION MECHANISM Filed 00 11. 11. 1926 2 Sheets-Sheetl .June 7. 1927.

2 ae is-sheet Filed 001:. 11, 1926 Patented June 1927,

i of the shaft or 1 UNITED STATES I JAMES'JLG'. HnYDmfoF PIT s IELn, WISCONSIN.

rnenslvrrssron 'MEc ANIsM.

'Appli cation filed October11,1926.'- Serial No.140,86 0.

This invention relates to transmission mechanism, and is particularly directed to a transmission mechanism for an automobile. Objects of this invention are to provide a novel form "of transmission mechanism in which the drive is balanced sothat there are no unequal forces exertedupon the main drive shaft, but instead, in which the-forces 2 means is provided for locking the transmission in either of its two positions, so as "to prevent inadvertent openingof the transmission gear train. y

Further objects are to provide a novel and extremely simple type of reversing mechanism for the transmission to permit ready reversal of the drive. i

' Further objectsare to provide'a transmission in which the change from one drive tothe other drive is easilymanually controlled. and iniwhich springsare provided for aiding in completing the change from one drive to another drive to thus cause-the gears to snap into therr'new posit on. I

An embodiment of the-invention-is shown in the accompanying drawings in which Figure ,1 is a plan view of the transmission with a part of the casing removed and with some of the parts in section,*the upper springs and the upper portion of the lock-7' ing means being omitted for the sake of clearness;

Figure 2. is a, 'longitu'dina'l sectional view on the line-2.-2 of Figure I; p a a Figure3'is an enlarged transverse view -'on the line'3'3 of Figure 1';

' Figure l is 'a. detail ofone of the pivotally I mounted gears; I d

Figure 5 is adetail partly in section approximately on-the line 5 '5 of Flgure 1; 1

Figure 6 is a side elevatlon partly in secmechanism.

or the tion corresponding tot-he line 6-6 'o f 'Figure' 5.

,Referring to the 1 drawings, will be seen that the transmission is carried :within a housing 1; The engine shaft 2 projects into v the forward end of the housing, asshown most clearly .in Figure2. The main drive shaft 3 is carried in axial-alignment with theiengineshaft' 2, and the end shaft or driven shaft 4 is mounted in axial alignment withthe shaft 3,so that in reality,

there: arethree shafts, 2 3,eand 4E, forming a straight llne through the transmission The Shaft 3:preferably is oeketed-within .theshaft2 at its forward end and may be coupled thereto in driving relation by means of the clutch mechanism illustratedinFig ure 2, and-controlled by the clutch rock shaft 5-. This clutch mechanism may comprise a'drum 6 against which shoes 7 are forced by means ofthe links 8 and levers' 9.

The levers 9 V are provided] with relatively long'arms 10 which are connected by means of links 11' with a sliding block 12, loosely splined upon the shaft 3. This sliding block is operated by means of levers 13 rigid with the clutch rock shaft 5, Preferably, a

Spring 14: is interposed between the driven CllSC or'plate 15 and the blockor cross head by hubs projecting from these members. It 1s to be notedthat the'disc .15 'g'u'ides the 12, such springbeing conveniently carried 4 shoes 7an'd is'rigidly secured to'the shaft i 3. Thus, when the-clutch is closed, the shoes 7 engage the drum 6 and 'are'held in engagement by means of the spring 14, and

an operative drive is established between the shafts 2 and q g p The shaft4 i's'provide'd witha rigidly mounted gear. 16, as shownin Figuresl' and 2, This gear 16 meshes with a: pair of pivotallyjmounted gears 17, such latter; gears.

being positioned on opposite sides "of the gear 16 in a balancedv; rel ation, so that the tlirust fromtlie gears is balanced with regard to tlie'shaft 4. The gears 17,as shown most clearly. in Figure 4, are carried in small frames "or bearingsl8 vwhich are pro vided with upper and lower pivots or trunnions 19 seated within sockets formed in um I the transmission casing s'uch transmission casrngbemg preferably formed of two main members or parts, as indicatedin the draw mounted gears 21 V The gears 17 are rigidly carried by slanting jack shafts 20' (see Figure 1),; such shaftscarrying at their other ends rigidly The ends of the shafts 20 are carried in sliding blocks 22 shownin dotted lines in Figure l, and in section in Figure 5. These sliding bloclrsare guided.

within rectangular guides 23 rigidly formed faces of theaslidingr blocks, Further, it is.

to be noted, that the channel shaped guides 23 are provided. with' transverseslots 26 across their top faces. Thepurpose of'these slots will be hereinafter described.

v Eac'hof the shafts-2O is provided with a pair of spaced collars between which.

bearing members 28. are held. Tl'lesebearing members 28, as may be seen from Fig t1 I'8i3', are preferably fo-rn'iedfrom: two; separate and similar half sections -wh1-eh are bolted together or el'asped around the shaft 20'to, permit free rotation of the shaft." At

their upper and lower ends, these bearing,

members 28 are provided with proijeeting pins 29 which 'forln pivots for the" toggle links 30. The inner ends of these toggle links are pivoted upon asliding bearing member 31, This sliding bearing member encloses a portionfof the sleeve 32, such.

sleeve having collars or enlargements between whicl-i the bearing member 81 works. Further, it is to be noted that springs 33 are positioned between the pins 29 and tend to draw upon the bearing members 28 towards each other, andto thus draw the free ends or rocking ends each other.

It is-to be'noted from Figures 1 and 2,

of the shaft towards that the sleeve 32 rigidly carries a small gear and a larger gear Further. it

is to be noted that this sleeve is provided with collars- 36 at its forwardend between which a ring 37 is 'mounted. The ring is provided with projecting pins 38 which work in slots formed in the shift lever 39,

such shift lever being carried rigidly by the transverse rock shaft Further, it is'te be; noted that the sleeve 32 is loosely splined to the shaft 3, asmay be seen from Figure 2. From the jinechanism thus far, described,

"it is apparent that when the shaft 40 is rocked that the sleeve '32 is shifted axially of the shaft 3, and that the toggle ,links force the shafts 2O apart and disengage the gears 21 from the gear 35. Thereafter, the gear 35 shifts completely out of the range of the gears 21, and the gear 34 takes its plate. Continued motion of the sleeve, which is L also aided by the springs 33, "tending to contract the toggle levers, results in the inward motionlof the gears 21 into; engagement or into mesh with the gear3 l. Thus the ratio between the shaft 3 and the shaft it is readily altered by merely rocking the shaft-40. In addition .to this, the gears go into-vinesh under the additional urge of the springs 83', so that a quick snap or quick "actioir'is secured by this mechanism'with assurance that the gears will be positively in mesh; This avoids the chipping of the corners of'the gears, as has heretofore been the objection to the ordinary sliding type of gear in an automobile transmission. 7

"Additional means are prov ided for" lock ing the sliding blocks 22 -ineither extreme position For instance, as shown-in-Figure' 5,-segmentalmembers 4L1 are carried or pivoted: u pon a' supportingshaft 42. These members are operated: by meansof a link 48 connecting them with lever'M carried rigidly by the rock shaft, 40. ,Further. it is to be noted that the segmental members are 'prownded with pins or pro ections and 46, which rocl: within the slots-26 formed in'the guides 23vand respectively enter the slots 2% or the'slots 25; I

. These slots are so slanted, as shown in Figure 1, that they accommodate the inward motion of the blocks while the gears 21 go into mesh with either the gear 34, or the gear 35. Olmionsly,after the pins or ears 4a or a6 have engaged their appropriate slots, the gears 21 are locked in mesh In otherwith the selected gear 34; or 35. words, the member as enters-tlieslot 24: at one locked position, and the member l -6 enters the slot 25. in the other locked position, The slot 26'serves as a guide for the rockingmember 41. r

The shaft 4 carries a bevel gear 4&7 which meshes vwith .a horizontal bevel 48. This bevel 48 is formed integral with a second or inner. gcar lt), as shown inFigures "1 and 2. The gear 49 meshes with a sliding gear. 50 slidably keyed to thedrive-n shaft 51. This. driven shaft 51 is car ied at one end-in a bear formed inthe casing l, and at its other enc sockcted within the shaft 4 at thegpoint where the shaft-4t is iOt) carried within its hearing, The gear fillis provided 1 with ,a slot within which a ring 52 15 mounted. The ring 52 is p voted by means of the levers 53 c2 ried 'bythe rock shaft 54.. The shaft 54 constitutes/the.re-

versing shaft, for it will be seen that when the gear ,50 is rocked from 'the position shown in Figure 1, to the other side; that the direction of rotation of the shaft51 isreversed as it then meshes with the, gear 49 on the opposite side from that. at. which it-initially meshed. 1

It will be seen that a novel'form of transmission has been provided by this invention in which a balanced drive is secured through the jack shafts and the, peculiar mode in which they are operated.

Further, it will be seen that the change gears are locked in mesh in their respective adjustments.

It will be seen further that the change from one speed to another speed may be very readily secured by this mechanism. Fur,-

ther, it is tov be noted that two forward speeds and two reverse speeds are also provided. I l

Although the invention has been described I in considerable detail, suchdescription is intended as illustrative rather than limiting as the invention may be variously embodied and as the scope of such invention is 'tobe determined as claimed.

I claim:

1. A transmission mechanism comprising two coaxial shafts, one of said shafts having a pair of gears slidably keyed thereto, the

other of said shafts having a, gear rigid thereon, a pair of rocklng ack shafts hav- I ng gears meshingwith the rigidly mounted gear and having gears at their free ends adapted to be rocked inwardly or outwardly, and means for shifting said slidably mounted gears and simultaneously rocking said jack shafts to cause the gears atthe free ends of said jack shafts to engage either of saidslidably mounted gears.

2. A transmission mechanism comprising a shaft having a sliding sleeve splined-thereon provided With a large gear and a small gear, means for shifting said sleeve, a second shaft having a rigidly mounted gear, a pair of jack shafts pivotally mountedv adjacent gears adapted to mesh with either the large gear or the small gear, and means for rocking the free ends of said 136k shafts 1nwardly and outwardly.

4. A transmission mechanism comprising.

a shaft having a sliding'sleeve splined thereon provided With a large gear and a small gear, means for shifting said sleeve, a second shaft having a rigidly mounted gear, a pair of jack shafts pivotally mounted adjacent one end and provided-with gears meshing with said last mentioned gear and having gears adapted to meshwith either the large gear or the small gear, and means for rocking the freeends 'of said jack shafts in wardly and outwardly, said means being operatively connected with the sleeve. 5. A transmission comprising ashaft havprovided with a large gear and a small gear, a second shaft axially saligned with said first .ing a sleeve slidably splined thereon'and mentioned shaft and having a rigidly mount- 1.

ed gear-,a pair of jack shafts having gears at one end located on oppositesides of and meshing with said rigidlymounted gear,v '75 1 said jack shafts being pivotallymounted ad jacent saidendfand each having a gear adjacent the other end adapted to. mesh with either said largegear or said small gear, and v toggle mechanism operated by said sleeve for moving thelgearsat the free end of said jack shaft into or out of mesh with said large gear andsaid small gear. 7

6. A- transmission comprising a shaft hav ing a slidably splined sleeve mounted thereon and provided withalarge and a small gear, a pair ofjack shafts mountedonoppo site sides of said firstinentioned shaft, toggle mecha'nism for rocking said jack shafts inwardly or outwardly With reference to said first mentioned shaft, said toggle mechanism being operatively connected to said sleeve, a pair of channel shaped guides, blocks forming bearings for the ends of said jack shafts and slidably mounted in said guides, a rocking locking member actuatedto lock said-blocks in either extreme position, a second shaft mounted in alignment with said first mentioned shaft. and having a gear thereon, a, pairof gears carried by theends of said jack shafts and meshing with said last mentioned gear, and pivotal bearings carrying the said jack shafts and permitting free swinging motion thereof, said jack shafts having gears at their free ends adapted to mesh with said large or said small gear when said blocks are locked.-

In testimony that I claim the foregoing If have hereunto set my hand atPittsfield, in the county of Brown, and State of VVisconsin. j I

JAMES o. HEYDAQA, i" 

